Stacked core for stationary induction apparatus

Abstract

In a stacked core (1, 21) for a stationary induction apparatus according to an embodiment, joint surfaces where yoke portions (2, 3, 12, 22, 23) and leg portions (4, 5, 6, 11, 24, 25, 26) are joined have protrusions (8, 13) formed from a plurality of magnetic members (7), and recesses (9, 14) formed from a plurality of magnetic members alternately, and the yoke portions and the leg portions are configured to be butted in such a form that the protrusions and the recesses mesh with each other, sheet-like magnetic insulators (10, 15) are each disposed in a butt-joint portion between the protrusions and the recesses in such a form as to bend in a bellows shape along a butt line, and an air gap is provided, and in a relationship between the number of the stacked magnetic members forming each of the protrusions and the number of the stacked magnetic members forming each of the recesses, the number of the stacked magnetic members forming each of the protrusions is made smaller than the number of the stacked magnetic members forming each of the recesses corresponding to a thickness of the magnetic insulator.

The invention claimed is: 
     
       1. A stacked core for a stationary induction apparatus comprising:
 upper and lower yoke portions configured by stacking a plurality of plate-shaped magnetic members; and 
 at least two leg portions configured by stacking a plurality of plate-shaped magnetic members and vertically connecting both ends of the upper and lower yoke portions, the stacked core being configured by butt-joining the yoke portions and the leg portions, wherein 
 joint surfaces where the yoke portions and the leg portions are joined have protrusions formed from the plurality of magnetic members, and recesses formed from the plurality of magnetic members alternately, and the yoke portions and the leg portions are configured to be butted in such a form that the protrusions and the recesses mesh with each other, 
 sheet-like magnetic insulators are each disposed in a butt-joint portion between the protrusions and the recesses in such a form as to bend in a bellows shape along a butt line, and an air gap is provided, and 
 in a relationship between the number of the stacked magnetic members forming each of the protrusions and the number of the stacked magnetic members forming each of the recesses, the number of the stacked magnetic members forming each of the protrusions is made smaller than the number of the stacked magnetic members forming each of the recesses corresponding to a thickness of the magnetic insulator. 
 
     
     
       2. The stacked core for a stationary induction apparatus according to  claim 1 , wherein joint portions between the yoke portions and the leg portions are butted in an inclined state to form a frame-shaped joint. 
     
     
       3. The stacked core for a stationary induction apparatus according to  claim 1 , wherein a thickness dimension of the magnetic insulator corresponds to a thickness dimension of the single magnetic member. 
     
     
       4. The stacked core for a stationary induction apparatus according to  claim 1 , wherein a thickness dimension of the magnetic insulator corresponds to an integral multiple of the thickness dimension of the single magnetic member. 
     
     
       5. The stacked core for a stationary induction apparatus according to  claim 2 , wherein a thickness dimension of the magnetic insulator corresponds to a thickness dimension of the single magnetic member. 
     
     
       6. The stacked core for a stationary induction apparatus according to  claim 2 , wherein a thickness dimension of the magnetic insulator corresponds to an integral multiple of the thickness dimension of the single magnetic member.